Some free stuff (mostly non-steam)

• Steam (some may be used):
  Rush Bros KZPB0-E49CM-455PX
  Gravi G3X4Z-5EQGR-NQX0Q
  Knytt Underground DFWQ7-NRL3M-B35AV
  Warlock 90IPZ-FTA00-FI6YA
  Stealth Inc 2: A Game of Clones FIGNC-LZXJ7-L35HP
  Stealth Inc 2: A Game of Clones 4H3MY-JH7C9-7WI5N
  Dungeon Defenders II - Free Edition (https://steamdb.info/sub/77375/) 2H25W-NQKRB-ERMW4
  Dungeon Defenders II - Free Edition (https://steamdb.info/sub/77375/) LDGJY-JAD42-2RXTB
  Dungeon Defenders II - Free Edition (https://steamdb.info/sub/77375/) 7MQHZ-2WQH0-BC5XM
  Dungeon Defenders II - Free Edition (https://steamdb.info/sub/77375/) MXHMF-R8A5V-CA0RQ
  Brawlhalla Beta IN6X6-0TQQD-R0LEE
  Brawlhalla Beta YK22W-AXW7T-2H92B
  Brawlhalla Beta 79GBF-60PNM-ERGBD
  Brawlhalla Beta QMAHR-K8PN6-929W8
  Brawlhalla Beta 9PRZ8-R5QWM-M7R7I
  Sins of a Dark Age X3VLC-9MZRE-A0488
  Sins of a Dark Age QHVTH-RV8ZK-9MCCY

• Desura:
  BOXESWITHGUNS YF74B-E41RP-WKX4T-7VGAJ-8TKHQ
  SANCTUARYRPG IVZ26-7K8VW-T650D-B7LY3-9353K

• GOG:
  http://www.gog.com/redeem/ZT6B34AF Blackguards 80% GOG.com Discount Key

• Other stuff (some may be expired):
  APB Reloaded kraken Free Premium Item Pack 6FKW-CX2C-HPVV-S21E
  Dragon’s Prophet www.DragonsProphetTheGame.com CKUE-GEHH-XD2T-HHT7-6MEN A3RG-3JPA-XZTG-29PA-RTHT ZAFT-7NE7-Z2FA-XACD-PJT2
  Neverwinter https://my.perfectworld.com/nw/redeemkey WCZ64-C7B-39EY XRE25-M3S-16SZ YEJ64-A1E-17WC
  www.worldofwarplanes.com HFRE75S-W2XW7PE for new user
  Inferno Legend http://il.gamebox.com/ CJG2LLE4BBL3BG2 BDE8FB8DL4BLG5C ELJLDK8BBGHBC88
  Doki-Doki Universe Personality Quiz - PlayStation Store Voucher BG9C-DQN3-9PG7 7TQ8-KFNM-6ABT
  Duel of Champions www.DuelOfChampions.com IGNP-4APR-CJHC-EWCZ IGNP-FP7M-CESQ-FRHX IGNP-ZSJR-E7XA-ZNMQ
  The Collectables www.thecollectablesgame.com IGN
  https://www.themightyquest.com/affiliate?code=MQEL_NCSA_02_0192_06_259_21_0314_05&utm_source=ign&utm_medium=partnership&utm_content=code&utm_campaign=MQEL_NCSA_02_0192_06_259_21_0314_05 47GD64WL777PJPEM WJFETDXWTXAXDLRR 6PTD6D5TRJ5HN7RG
  Heroes & Generals 3 Day Veteran Membership http://www.heroesandgenerals.com/ FUQS6346H0LJ2STEA9 R770R3FW02XWJSJREU XCJR18ADCGW9ZRTCMW
  Orcs Must Die! Unchained Beta http://www.orcsmustdie.com/ x9w7dpdf6y5a3lcmmhc96f9m7 hh5wkyjga3445y4hahrdmpktr
  Zombies Monsters Robots Beta www.playzmr.com TJND97WCR6PKWAAR XTT3MHRD964HJGAN HJW75EJN5JRPAR5F
  Marvel Heroes 2015 Free Random Hero Box https://marvelheroes.com/ RHBX-IGNP-1TWM-OXZ4 RHBX-IGNP-BUNF-GM66 RHBX-IGNP-CRYS-IPZ1 RHBX-IGNP-6O17-BATH RHBX-IGNP-P3CE-NVQK
  Dizzel https://id.ogplanet.com/affiliateRedirect.og?fp=Redeemign&gid=28 30A8FD0C27 F512AA7D70 221E23134D
  Disc 1 of the Borderlands: The Pre-Sequel! Soundtrack
  http://www.sumthing.com/borderlandspresequel 4AQ65MP8YE 4AQX1R1FDZ 4AQX77PGF8 4AR3NJTKPR 4ARMUMPIZ7
  Neverwinter Harper Bard Companion Pack (Xbox One, Expires January 1, 2016) 5lsyw1de2ocxbtbw 5lx23dh2jc0yrb1s 5lzd7uh1t95f6t4o 5m25d9fck8zrgwz1 5m4qqrhk36g8iirz
  MARCH OF WAR - $10 IN GAME COUPON C2A-2PZ-HJV
  FROZEN HEARTH (Game Activation Key) 17EB-2FE6-4048-8ED8
  CITY OF STEAM: ARKADIA DLC (In-Game Activation Key ORANGE BUNDLE DLC) 934t39bcd09fndep
  BIGHEAD BASH IN-GAME CONTENT PACK I-RHCW-JMUG-RLFY
  World of Warships Closed Beta F93KR-P4RBP-UW3DU-3CUY2 World of Warships Bonus Content M539M-HUEHN-VPNR6-XVFPV World of Tanks Invite Code RMSZ6-3NWZ5-ZN4K5-BSVMF https://support.humblebundle.com/hc/en-us/articles/206468517 Note: Keys are only applicable to the North American (NA) server.
  WildStar Standard Edition OG71IX302468I5TW1PH2 https://support.humblebundle.com/hc/en-us/articles/205741398 This key expires on 12/31/2015.
  Warframe 7-day Credit and Affinity Booster Packs 0508-4D0E-8DC6-62E5 https://support.humblebundle.com/hc/en-us/articles/205741438
  Warframe Booster Pack 950C-8643-F623-95C7 https://support.humblebundle.com/hc/en-us/articles/202421564
  Twitch Turbo https://secure.twitch.tv/products/turbo/ticket/new?discount_code=JKMP2WMGQ2GHFV3D Credit Card required to activate. Code expires 7/1/2016. https://support.humblebundle.com/hc/en-us/articles/205741548
  Trove Closed Beta Humble - Extra Life Starter Pack RLPN-DEYE-CYLC-J9Z7-NQP7 https://session.trionworlds.com/login?service=https%3A%2F%2Fstore.trionworlds.com%2Fj_spring_cas_security_check https://support.humblebundle.com/hc/en-us/articles/203419260
  Strife Closed Beta PCGUC-OK762-XOEDC-6FSRS-YRU3J https://strife.com/login#create
  Stencyl: Indie Edition 1-Year License CFHFK-RRSC8-W4RNS-G64BX-C2GE4 http://www.stencyl.com/redeem/ https://support.humblebundle.com/hc/en-us/articles/206836057 Expires: 10/21/2015
  Star Realms Full Version HBDM-AZJV-KHNU https://support.humblebundle.com/hc/en-us/articles/203701804
  SMITE - Almighty Zeus TY2C900820BBD044E https://support.humblebundle.com/hc/en-us/articles/202421614
  SMITE Loki Pack PCLK72E49B9A50602 https://support.humblebundle.com/hc/en-us/articles/205741858
  SMITE Xbox One Closed Beta CFXYM-M6P99-K2KDY-XDTGG-GD2VZ https://support.humblebundle.com/hc/en-us/articles/205741858
  Sky Nations JWZWI-GAERQ-ZEQWH-SQSPQ http://skynations.net/?page=redeem
  Scrolls Full Version HUR4-M7G4-K7Q8 https://support.humblebundle.com/hc/en-us/articles/203728574
  reddit gold 30-Day Subscription QUKCC-SWCZK https://www.reddit.com/gold/
  Multimedia Fusion 2 Registration Key (non-steam) MTNS67-7W4DA3G3-VRXA5Y
  Might & Magic Heroes Online - Angel Starter Pack MMH-486E-4965-087B-6459 https://support.humblebundle.com/hc/en-us/articles/205668287
  AirMech Prime A7RE-GAES-C3PQ-AAOI https://www.carbongames.com/redeem/
  BloodRealm: Battlegrounds Debut Champion "Lora" + 3 Elite Packs (Early Access) HASKMQLSB8R https://support.humblebundle.com/hc/en-us/articles/204073420
  Defiance NFE7-ZXTH-CL2E-XFNK-C2GZ http://www.defiance.com/redeem https://support.humblebundle.com/hc/en-us/articles/204392188
  Defiance Humble - Extra Life Starter Pack GEKN-ETGD-RGXF-EJHR-9HRY https://session.trionworlds.com/login?service=https%3A%2F%2Fstore.trionworlds.com%2Fj_spring_cas_security_check https://support.humblebundle.com/hc/en-us/articles/203419260
  EVE Online: Trial Key AHH5A-7JCWT-CKQTH-85ZY2-YZTQ2-4YLNE-MC009 EVE Online: Rifter Ship Skin KKAZ76PQKVGV5Y87VSVDHDWK7 http://www.eveonline.com/Activate https://support.humblebundle.com/hc/en-us/articles/202730630
  EVE Online: Starter Pack PMHWR-YYK29-B7CAF-QDWEL-HKRSL-PQWXD-MU015 https://secure.eveonline.com/Activation/ https://support.humblebundle.com/hc/en-us/articles/202421514-EVE-Online-Key-Redemption
  Ghost Recon Phantoms E3 Avatar E3AV1GEHCTMROQKK Ghost Recon Phantoms Starter Pack E3ST39PXL7J2IGJO https://support.humblebundle.com/hc/en-us/articles/205741448
  Landmark 1-Week Closed Beta HMZT-HJ7T-R6KC-XFPH-VJZZ ERMZ-RCRC-646H-4H44-KHR6 https://support.humblebundle.com/hc/en-us/articles/202421594
  Race the Sun Flippfly http://flippfly.com/redeem/?key=QOT43WMWKH&email=enteryouremail@gmail.com 19IJX2OPW2

P.S. I know about "Drop Your Orphan Keys Here" thread.